CN110513568B - Heat preservation structure for pipeline joint - Google Patents
Heat preservation structure for pipeline joint Download PDFInfo
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- CN110513568B CN110513568B CN201910749341.1A CN201910749341A CN110513568B CN 110513568 B CN110513568 B CN 110513568B CN 201910749341 A CN201910749341 A CN 201910749341A CN 110513568 B CN110513568 B CN 110513568B
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- sleeve body
- pipeline
- electric hot
- heat insulation
- hot melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
- B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
- B29C65/3432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
- B29C65/344—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint being a woven or non-woven fabric or being a mesh
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
- B29C65/3444—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint being a ribbon, band or strip
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides a heat insulation structure for a pipeline joint, which belongs to the field of heat insulation pipeline construction and comprises an electric hot melting sleeve and a filler; the electric hot melting sleeve comprises two connecting sleeve bodies which are respectively sleeved on the peripheries of the pipelines at two sides of the pipeline joint, a heat insulation sleeve body which is arranged between the two connecting sleeve bodies and used for covering the pipeline joint, and a sealing connecting layer structure which is arranged on the inner side of the connecting sleeve body and used for being welded and sealed with the outer wall of the pipeline; the heat insulation sleeve body is provided with an air outlet and a material injection hole for injecting the filler, and the filler is filled in the inner side of the heat insulation sleeve body through the material injection hole. The heat insulation structure for the pipeline joint provided by the invention has a simple structure, does not need to thicken a pipeline, has little difference with the thickness of a heat insulation layer of a straight pipeline section of the pipeline, can effectively meet the construction requirement, can effectively insulate the joint position through the injected filler, reduces the overall cost of the pipeline heat insulation material to the maximum extent, and simultaneously ensures the heat insulation safety of the pipeline.
Description
Technical Field
The invention belongs to the technical field of heat-insulating pipeline construction, and particularly relates to a heat-insulating structure for a pipeline joint and a construction method thereof.
Background
The heat-insulating pipeline with the socket joint type interface has the advantages of simple structure, convenience and rapidness in installation and low construction cost, and is widely applied to the fields of hot spring water conveying, cold water heat insulation, factory waste heat transmission, urban centralized heat supply and the like. In the interface area of the socket type heat preservation pipeline and accessories (a disk bearing, a disk inserting part, a pipeline connecting pipe fitting and the like) containing protrusions, the difference between the diameters of the protrusion part and the straight pipe section of the pipeline is different according to the difference of the nominal Diameter (DN) of the socket type heat preservation pipeline, namely, the larger the nominal diameter is, the higher the difference is. The heat preservation of prefabricated direct-burried heat preservation nodular cast iron pipeline socket area and contain protruding annex position is a big difficult problem of pipeline construction, and at present mainly there are two kinds of insulation construction: 1) the method is characterized in that a common HDPE (high density polyethylene) electric hot melting sleeve coiled plate in the market at present is adopted, the thickness of a heat-insulating layer of a straight pipe section of a pipeline except a socket joint type interface region is only ensured to meet the use requirement, the HDPE electric hot melting sleeve coiled plate is wound and bound after the interface region is simply processed, in the long-term heat supply process, the wound HDPE electric hot melting sleeve coiled plate and the outer wall of an HDPE pipeline 6 at the socket end of the pipeline are accelerated to age while the interface region causes great heat loss, the service life of the whole pipeline is shortened, in the long-term cold water heat-insulating conveying process, the heat-insulating effect of the interface region is poor, and a medium is possibly frozen in the interface region in a severe cold region; 2) the other method is similar to the interface area heat preservation method, and is different from the interface area heat preservation method in that the thickness of the whole pipeline heat preservation layer is increased, the socket interface area heat preservation layer is preferentially ensured to meet the requirement, namely the heat preservation requirement of the whole pipeline is met by increasing the thickness of the pipeline straight pipe section heat preservation layer, and the cost of the heat preservation material of the pipeline is greatly increased by the method.
To sum up, at present, no suitable heat insulation structure exists, the heat insulation effect can be met, the construction requirement can be met, even if the difference between the thickness of the heat insulation structure and the thickness of a heat insulation layer of a straight pipeline section of a pipeline is not large, the overall cost of a heat insulation material of the pipeline is reduced to the maximum extent, and the heat insulation safety of the pipeline is ensured.
Disclosure of Invention
The invention aims to provide a heat insulation structure for a pipeline joint, and aims to solve the technical problem that no heat insulation structure which can meet the heat insulation effect and meet the construction requirement is suitable in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: provided is a heat insulating structure for a pipe joint, including: the electric hot melting sleeve and the filler filled between the electric hot melting sleeve and the pipeline joint;
the electric hot melting sleeve comprises two connecting sleeve bodies which are respectively sleeved on the peripheries of the pipelines at two sides of the pipeline joint, a heat insulation sleeve body which is arranged between the two connecting sleeve bodies and used for covering the pipeline joint, and a sealing connecting layer structure which is arranged on the inner side of the connecting sleeve body and used for being welded and sealed with the outer wall of the pipeline;
the heat insulation sleeve is provided with an air outlet and a material injection hole for injecting the filler, and the filler is filled in the inner side of the heat insulation sleeve through the material injection hole.
Furthermore, the heat insulation sleeve body is an arc surface type sleeve body protruding outwards, the connecting sleeve body is a straight sleeve body, and the heat insulation sleeve body and the connecting sleeve body are in transition through an arc structure.
Furthermore, the thermal insulation sleeve body is a sleeve body with a trapezoidal axial cross section, the bending part of the trapezoidal sleeve body is in transition through an arc structure, the connecting sleeve body is a straight sleeve body, and the thermal insulation sleeve body and the connecting sleeve body are in transition through an arc structure.
Furthermore, the connecting sleeve body and the heat insulation sleeve body are both straight sleeve bodies, and the heat insulation sleeve body and the connecting sleeve body are in smooth transition.
Furthermore, the sealing connection layer structure comprises a first electrothermal fusion wire mesh which is embedded in the inner side wall of the connection sleeve body in a hot-pressing mode and is used for being welded with the outer wall of the pipeline.
Furthermore, the sealing connection layer structure comprises a first electrothermal melt roll strip arranged on the inner side of the connection sleeve body, a second electrothermal melt wire mesh which is embedded on the inner wall of the first electrothermal melt roll strip in a hot-pressing manner and is used for being welded with the outer wall of a pipeline, and a first electrothermal melt wire which is embedded on the inner wall of the connection sleeve body in a hot-pressing manner; the edges of two sides of the first electric hot melting winding strip are inclined planes which are mutually in lap joint and matched, and a second electric hot melting wire which is used for being in fusion joint with the other inclined plane is embedded in one inclined plane in a hot pressing mode.
Furthermore, the sealing connection layer structure also comprises a second electric hot melting strip arranged between the connection sleeve body and the first electric hot melting strip, and a third electric hot melting wire net which is embedded on the inner wall of the second electric hot melting strip in a hot-pressing manner and is used for being welded with the first electric hot melting strip; the edges of two sides of the second electric hot melting winding strip are inclined planes which are mutually overlapped and matched, and a third electric hot melting wire which is used for being welded with the other inclined plane is embedded in one inclined plane in a hot pressing mode.
Furthermore, one side of the electric hot melting sleeve is provided with a melting sleeve sleeving seam, two side wall surfaces of the melting sleeve sleeving seam are inclined surfaces which are in lap joint and matched with each other, and a fourth electric hot fuse which is used for being in fusion joint with the other inclined surface is embedded in one inclined surface in a hot pressing mode.
The heat insulation structure for the pipeline joint provided by the invention has the beneficial effects that: compared with the prior art, the heat insulation structure for the pipeline joint realizes the welding with the outer wall of the pipeline through the sealing connection layer structure on the inner wall of the connection sleeve body, the filler is injected into the inner space of the heat insulation sleeve body through the material injection hole after the connection, and the air is exhausted at any time through the air outlet hole in the injection process, so that the air pressure inside and outside the heat insulation sleeve body is ensured to be consistent, and the injection process is smoothly carried out. The heat insulation structure for the pipeline joint is simple, the pipeline does not need to be thickened, the thickness difference between the heat insulation structure and the heat insulation layer of the straight pipeline section is not large, the construction requirement can be effectively met, the injected filler can effectively insulate the joint position, the overall cost of the pipeline heat insulation material is reduced to the maximum extent, and meanwhile, the heat insulation safety of the pipeline is guaranteed.
The invention also provides a construction method of the heat insulation structure for the pipeline joint, which comprises the following steps:
sleeving the electric melting sleeves on the peripheries of the pipeline joints, and respectively sleeving the connecting sleeve bodies on the designated positions of the outer walls of the pipelines;
the sealing connection layer structure is in sealing fit with the outer wall of the pipeline through electrifying welding;
carrying out air tightness detection on the welding position;
the heat insulation sleeve body is provided with a material injection hole and an air outlet hole respectively, and filler is injected into the inner side of the heat insulation sleeve body through the material injection hole until the filler is filled in the inner space of the heat insulation sleeve body.
Further, the detecting the airtightness of the welding position includes:
a detection hole is formed in the middle of the heat insulation sleeve body, and air tightness detection is carried out through the detection hole;
the detection hole is the material injection hole;
set up notes material hole and venthole on the insulation cover body respectively, through annotate the material hole with the filler injection the insulation cover body is inboard, still include after the filler is full of the insulation cover body inner space:
and plugging the material injection hole and the air outlet hole.
The construction method of the heat insulation structure for the pipeline joint has the beneficial effects that: compared with the prior art, the construction method of the heat insulation structure for the pipeline joint has the advantages that the construction process is simple and rapid, the sealing performance of the welding position after construction can be guaranteed to be good through the air tightness test, the comprehensive cost of production and construction of the pipeline is effectively reduced, and the safety and reliability of the pipeline are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is an assembly structural view of a heat insulating structure for a pipe joint according to an embodiment of the present invention;
FIG. 2 is a left side view of the electrofusion sleeve of FIG. 1;
fig. 3 is an assembly structural view of a heat insulating structure for a pipe joint according to a second embodiment of the present invention;
fig. 4 is an assembly structural view of a heat insulating structure for a pipe joint according to a third embodiment of the present invention;
FIG. 5 is a left side view of the electrofusion sleeve of FIG. 4;
FIG. 6 is a left side view of the seal connection layer structure of FIG. 4;
fig. 7 is an assembly structural view of a heat insulating structure for a pipe joint according to a fourth embodiment of the present invention;
fig. 8 is an assembly structural view of the heat insulating structure for a pipe joint according to the fifth embodiment of the present invention;
fig. 9 is an assembly structural view of the heat insulating structure for a pipe joint according to the sixth embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-electric hot melting sleeve; 101-connecting sleeve body; 102-a heat-insulating jacket body; 2-a filler; 3-sealing the connection layer structure; 301-a first electro-thermal fusing screen; 302-a first electrofusion coil; 303-a second electrofusion screen; 304-a first electrothermal fuse; 305-a second electrothermal fuse; 306-a second electro-thermal fusion wrap strip; 307-a third electrothermal welding wire mesh; 308-a third electrothermal fuse; 4-air outlet holes; 5-material injection holes; 6-a pipeline; 601-a conduit body; 602-an outer protecting pipe; 7-fourth electrothermal fuse
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, 3, 4 and 7, the heat insulating structure for a pipe joint according to the present invention will now be described. The heat insulation structure for the pipeline joint comprises an electric melting sleeve 1 and a filler 2 filled between the electric melting sleeve 1 and the pipeline joint; the electric melting sleeve 1 comprises two connecting sleeve bodies 101 which are respectively sleeved on the peripheries of the pipelines 6 at two sides of the pipeline joint, a heat insulation sleeve body 102 which is arranged between the two connecting sleeve bodies 101 and used for covering the pipeline joint, and a sealing connecting layer structure 3 which is arranged on the inner side of the connecting sleeve body 101 and used for being welded and sealed with the outer wall of the pipeline; the heat insulating sleeve body 101 is provided with an air outlet 4 and a material injection hole 5 for injecting the filler 2, and the filler 2 is filled inside the heat insulating sleeve body 102 through the material injection hole 5.
Compared with the prior art, the heat insulation structure for the pipeline joint provided by the invention realizes the welding with the outer wall of the pipeline 6 through the sealing connecting layer structure 3 on the inner wall of the connecting sleeve body, the filler 2 is injected into the inner space of the heat insulation sleeve body through the material injection hole 5 after the connection, and the air is discharged from the air outlet hole 4 at any time in the injection process, so that the air pressure inside and outside the heat insulation sleeve body 102 is ensured to be consistent, and the injection process is smoothly carried out. The heat insulation structure for the pipeline joint is simple, the pipeline does not need to be thickened, the thickness difference between the heat insulation structure and the heat insulation layer of the straight pipeline section is not large, the construction requirement can be effectively met, the filler 2 injected can effectively insulate the joint position, the overall cost of the pipeline heat insulation material is reduced to the maximum extent, and meanwhile, the heat insulation safety of the pipeline is guaranteed.
It should be noted that the duct 6 includes a duct main body 601 and an outer protection pipe 602 covering the outer periphery of the duct main body 601, and an outer wall of the outer protection pipe 602 is an outer wall of the duct 6.
Specifically, the electric melting sleeve 1 is a high-density polyethylene coiled plate.
Referring to fig. 1 to 3, as an embodiment of the thermal insulation structure for a pipe joint provided by the present invention, the thermal insulation sleeve body 102 is an outwardly convex cambered surface type sleeve body, the connection sleeve body 101 is a straight sleeve body, and the thermal insulation sleeve body 102 and the connection sleeve body 101 are in transition through a cambered structure.
The electric hot melt cover is omega-shaped, the electric hot melt cover 1 of omega-shaped is the integral type shaping roll up board structure, and the circular arc structure can avoid stress concentration to cause electric hot melt cover 1 to tear in the in-process of production facility mould processing preparation and omega type HDPE (high density polyethylene) roll up board extrusion, pipeline life reduction scheduling problem. Aiming at prefabricated direct-buried heat-preservation nodular cast iron pipes with different calibers, the thickness of the omega-shaped electric melting sleeve 1 is 3 mm-18 mm.
Referring to fig. 5, as a specific embodiment of the thermal insulation structure for a pipeline joint provided by the present invention, the omega-shaped electrofusion sleeve has a reasonable protrusion height of the thermal insulation sleeve body 102 according to the height difference between the bell mouth and the straight pipe section in the socket area of the prefabricated direct-buried thermal insulation nodular cast iron pipe with different calibers, and the outward protrusion height of the cambered thermal insulation sleeve body 102 is greater than or equal to 20 mm. The width of the heat insulation sleeve body 102 is more than or equal to 200mm, and the length of the bearing socket area of the prefabricated direct-buried heat insulation nodular cast iron pipes with different calibers is set to be not less than the length.
When the electric melting jacket 1 is in an omega shape, as a specific embodiment of the heat insulation structure for a pipeline joint provided by the present invention, the sealing connection layer structure 3 includes a first electric melting wire mesh 301 which is embedded on the inner side wall of the connection sleeve body 101 by hot pressing and is used for being welded with the outer wall of the pipeline 6. Correspondingly, the width of the connecting sleeve body 101 is more than or equal to 30mm and is used for embedding the first electrothermal melt wire mesh 301.
Referring to fig. 8 and 9, as an embodiment of the thermal insulation structure for a pipe joint provided by the present invention, the thermal insulation sleeve body 102 is a trapezoidal sleeve body with a trapezoidal axial cross section, the bending portion of the trapezoidal sleeve body is transited through an arc structure, the connection sleeve body 101 is a straight sleeve body, and the thermal insulation sleeve body 102 and the connection sleeve body 101 are transited through an arc structure. Correspondingly, the width of the connecting sleeve body 101 is more than or equal to 30mm and is used for embedding the first electrothermal melt wire mesh 301. The electrothermal welding sleeve 1 is of an integral forming rolled plate structure, the trapezoidal sleeve body structure can avoid the problems that the electrothermal welding sleeve 1 is torn, the service life of a pipeline is reduced and the like due to stress concentration in the processes of production equipment mold processing and manufacturing and HDPE (high density polyethylene) rolled plate extrusion forming, and meanwhile, the processing and manufacturing difficulty is small, and the manufacturing cost is relatively low.
Referring to fig. 4 to 7, in an embodiment of the thermal insulation structure for a pipe joint provided by the present invention, the connecting sleeve body 101 and the insulating sleeve body 102 are straight sleeve bodies, and the insulating sleeve body 102 and the connecting sleeve body 101 are in smooth transition.
Referring to fig. 4 to 7, as an embodiment of the thermal insulation structure for a pipe joint provided by the present invention, the sealing connection layer structure 3 includes a first electric hot-melting coil strip 302 disposed inside the connection sleeve body 101, a second electric hot-melting wire mesh 303 embedded in the inner wall of the first electric hot-melting coil strip 302 by hot pressing and used for being welded to the outer wall of the pipe 6, and a first electric hot-melting wire 304 embedded in the inner wall of the connection sleeve body 101 by hot pressing; two side edges of the first electric hot melt winding strip 302 are inclined planes which are mutually overlapped and matched, wherein a second electric hot melt fuse 305 for being welded with the other inclined plane is embedded on one inclined plane in a hot pressing mode. Correspondingly, the width of the connecting sleeve body 101 is more than or equal to 30mm and is used for embedding the first electrothermal fuse 304.
The edges of the two sides of the first electric hot melting winding strip 302 are polished to leave inclined planes which can be mutually lapped, so that the end part and the outer wall of the pipeline 6 are in sealing connection with the external electric hot melting sleeve 1 without gaps. The two sections of the first electrothermal fuse 304 embedded in the inner wall of the connecting sleeve body 101 by hot pressing can be completely overlapped on the first electrothermal fuse strip 302, and the width of the first electrothermal fuse strip 302 is designed and produced to be the same as the width of the first electrothermal fuse strip 302.
Referring to fig. 4 to 7, as an embodiment of the thermal insulation structure for a pipe joint provided by the present invention, the sealing connection layer structure 3 further includes a second electric hot-melting strip 306 disposed between the connection sleeve 101 and the first electric hot-melting strip 302, and a third electric hot-melting wire mesh 307 embedded in the inner wall of the second electric hot-melting strip 306 and used for being welded to the first electric hot-melting strip 302; the two side edges of the second electric hot melt winding strip 306 are inclined planes which are mutually overlapped and matched, and a third electric hot melt fuse 308 which is used for being welded with the other inclined plane is embedded on one inclined plane in a hot pressing mode. The first electrothermal fuse 304 attached to the inner wall of the jacket body 101 is used for fusing with the second electrothermal fuse strip 306.
The edges of the two sides of the second electric hot melting winding strip 306 are polished to leave inclined planes which can be mutually lapped, so that the end part and the outer wall of the pipeline 6 are in sealing connection with the external electric hot melting sleeve 1 without gaps. The two sections of the first electrothermal fuse 304 embedded in the inner wall of the connecting sleeve body 101 by hot pressing can be completely overlapped on the second electrothermal fuse strip 306, and the width of the first electrothermal fuse 304 is designed and produced to be the same as that of the second electrothermal fuse strip 306.
According to the structure, the electric melting sleeve 1 and the sealing connection layer structure 3 are integrally matched to form an n-shaped structure, different sizes are designed according to the height difference between the socket region and the straight pipe section of the prefabricated direct-buried heat-insulation nodular cast iron pipe bearing with different calibers and the length of the interface region, the general thickness of the electric melting sleeve 1 is not more than 18mm, and the width is not less than 30 mm.
Referring to fig. 2 and 5, as an embodiment of the thermal insulation structure for a pipe joint provided by the present invention, a melting sleeve sleeving seam is provided at one side of an electric melting sleeve 1, both side wall surfaces of the melting sleeve sleeving seam are inclined surfaces which are in mutual overlapping fit, and a fourth electric melting wire 7 for being welded to the other inclined surface is embedded in one of the inclined surfaces by hot pressing.
It should be noted that each of the electrothermal fuses and the electrothermal fuse net extends outward to expose the connector lug for connection with the welding equipment.
The invention also provides a construction method of the heat insulation structure for the pipeline joint, which comprises the following steps:
sleeving the electric melting sleeve 1 on the periphery of a pipeline joint, and sleeving the connecting sleeve bodies 101 on the designated positions of the outer wall of the pipeline respectively;
the sealing connection layer structure 3 is in sealing fit with the outer wall of the pipeline 6 through electric welding;
carrying out air tightness detection on the welding position;
the heat insulation sleeve body 102 is respectively provided with a material injection hole 5 and an air outlet hole 4, and the filler 2 is injected into the inner side of the heat insulation sleeve body 102 through the material injection hole 5 until the filler 2 is filled in the inner space of the heat insulation sleeve body 102.
The construction method of the heat insulation structure for the pipeline joint, provided by the invention, has the advantages that the construction process is simple and rapid, the sealing performance of the welding position after construction can be ensured to be good through an air tightness test, the comprehensive cost of production and construction of the pipeline is effectively reduced, and the safety and reliability of the pipeline are improved.
In one embodiment of the method for constructing a heat insulating structure for a pipe joint according to the present invention, the detecting the airtightness of the welded portion includes:
a detection hole is formed in the middle of the heat insulation sleeve body 102, and air tightness detection is performed through the detection hole.
As a concrete implementation mode of the construction method of the heat insulation structure for the pipeline joint, provided by the invention, the detection hole is a material injection hole 5;
the heat insulating sleeve body 102 is respectively provided with a material injection hole 5 and an air outlet hole 4, the filler 2 is injected into the inner side of the heat insulating sleeve body 102 through the material injection hole 5, and the heat insulating sleeve body further comprises the following steps after the filler 2 is filled in the inner space of the heat insulating sleeve body 102:
and the material injection hole 5 and the air outlet hole 4 are blocked.
On the basis of the above construction method, when the electrofusion sleeve 1 is in an omega shape, as a specific implementation of the construction method of the thermal insulation structure for the pipeline joint provided by the present invention, sleeving the electrofusion sleeve 1 on the outer periphery of the pipeline joint, and respectively sleeving the connecting sleeve bodies 101 on the specified positions of the outer wall of the pipeline specifically comprises:
the omega-shaped electric hot melting sleeve is firmly installed and tied in the interface area or the area containing the raised accessory, the straight section of the hot melt wire at two ends is completely lapped on the outer walls of the two pipelines 6, the lap joint is ensured to be in close contact, and the end containing the hot melt wire at the joint of the omega-shaped electric hot melting sleeve is in close lap joint with the end with the polished inclined plane.
As a specific implementation mode of the construction method of the heat insulation structure for the pipeline joint, the air outlet 4 and the material injection hole 5 are respectively positioned at the top of the central line of the welded omega-shaped electric hot melting sleeve 1.
As a specific embodiment of the method for constructing a heat insulating structure for a pipe joint according to the present invention, the filler 2 is a polyurethane foam mixture.
As a specific embodiment of the method for constructing a heat insulating structure for a pipe joint provided by the present invention, the blocking of the injection hole 5 and the air outlet hole 4 specifically includes:
the material injection hole 5 and the air outlet hole 4 are sealed by a special caulking block.
As a specific embodiment of the method for constructing a heat insulating structure for a pipe joint according to the present invention, before sleeving the electric melting sleeve 1 around the outer circumference of the pipe joint, the method further includes:
a. extruding the molten HDPE material by an extruder, and feeding the molten HDPE material into a runner mold;
b. the melted HDPE material flows into a vacuum shaping platform to obtain an omega-shaped HDPE plate;
the vacuum shaping platform mould is designed into a concave-convex roller according to the shape and the size of an omega-shaped electric hot melting sleeve 1, the concave-convex size of the roller is more than 3mm higher than that of the electric hot melting sleeve, the problem of insufficient protrusion of the omega-shaped plate caused by plate shrinkage is solved, and the concave-convex roller of the vacuum shaping platform can adjust the thickness of the plate up and down;
c. the omega-shaped HDPE plate slides on the cooling bracket to be cooled;
the omega-shaped HDPE board is pulled by a traction roller, and the shape of the traction roller is the same as the concave-convex size of the vacuum shaping concave-convex roller;
d. cutting the omega-type HDPE board into preset lengths;
cutting according to the length requirement by adopting a saw blade type cutting machine, movably cutting according to the moving speed of an omega-shaped plate, and automatically returning after cutting;
e. polishing the omega-shaped HDPE board on line;
the three-dimensional 180-degree angle adjustment is realized, the throwing and cutting width adjustment and the lifting adjustment are realized, and the upper part and the lower part of the throwing knife are provided with dustproof protective covers, so that the dustproof effect can be achieved to the maximum extent;
f. covering the net on the polished omega-shaped HDPE board on line;
the width of the electrothermal melting wire mesh is implemented according to the design requirement, and the electrothermal melting wire mesh with different widths of more than or equal to 30mm is generally implemented according to the length of the connecting sleeve body 101;
g. after the omega-shaped plate is formed and covered with the net, the plate is quickly rolled up by adopting a two-concave-one-convex plate rolling machine, and the size of a concave-convex mould roller of the plate rolling machine is the same as that of a shaping roller, so that the finished omega-shaped electrofusion sleeve 1 is obtained.
In the early design process, a custom electric hot melt sleeve production device is designed, wherein a device die: the vacuum shaping roller and the traction roller are designed into a concave-convex roller, the cooling bracket is designed into a concave shape, the concave-convex size is similar to that of the omega-shaped electric hot melting sleeve 1, and the arc size of the convex roller and the concave roller is more than or equal to that of the omega-shaped electric hot melting arc bulge size by more than 3 mm;
the cutting machine is designed as a saw blade cutting machine and can cut movably according to the extrusion speed of the omega-shaped plate;
the lapping machine is designed into a concave-convex roller, and the concave-convex size is the same as that of the omega-shaped electric hot melting sleeve 1;
the edge polishing machine and the plate bending machine are designed, the edge polishing machine can be adjusted by 180-degree three-dimensional angles, meanwhile, the edge polishing machine has the functions of adjusting the polishing and cutting width and adjusting the lifting, the edge polishing machine can be used for polishing and grinding up and down along the concave-convex shape of the omega-shaped electric hot melting sleeve 1, the plate bending machine is designed into two concave-convex rollers, and the concave-convex size of the plate bending machine is similar to the shape of the omega-shaped electric hot melting sleeve 1.
On the basis of the above construction method, when the electrofusion sleeve 1 is n-shaped, as a specific embodiment of the construction method of the thermal insulation structure for the pipeline joint provided by the present invention, before the step of sleeving the electrofusion sleeve 1 on the outer periphery of the pipeline joint, the method further comprises:
designing a first electric hot melting winding strip 302 and a second electric hot melting winding strip 306 with the composite requirements on width and length according to the height difference between an interface area or an area containing a convex accessory and a pipeline straight pipe section and the thickness requirement of an insulating layer;
adjusting production equipment, extruding and cutting the HDPE strips into HDPE strips with required width and length, pressing and covering the second electric hot-melt screen 303 on the HDPE hot-melt strip for manufacturing the first electric hot-melt strip 302 by using a screen covering machine, and pressing and covering the third electric hot-melt screen 307 on the HDPE hot-melt strip for manufacturing the second electric hot-melt strip 306;
polishing and grinding two ends of one surface, which is not covered with the second electric hot melting wire mesh 303, of the HDPE hot melting strip for manufacturing the first electric hot melting strip 302 by adopting a special edge polishing machine to form an inclined surface, and polishing and grinding two ends of one surface, which is not covered with the third electric hot melting wire mesh 307, of the HDPE hot melting strip for manufacturing the second electric hot melting strip 306 to form an inclined surface;
respectively extruding the HDPE hot-melt strips into coils by using a plate bending machine;
respectively winding the first electric hot melting coil strip 302 which is extruded into a coil on the outer wall of the pipeline 6 at two ends of the interface area or the position containing the convex accessory, firmly binding by adopting a binding belt, and winding one or more circles of the first electric hot melting coil strip 302 to be electrified and welded with the outer wall of the pipeline 6 according to the design requirement;
alternatively, the first electrothermal welding strip 302 may be wound by one turn and electrically welded to the outer wall of the pipe 6, and then the second electrothermal welding strip 306 may be wound and firmly bound by a binding tape to electrically weld the first electrothermal welding strip 302.
The strapping tape is adopted for firm strapping and electric welding, so that seamless welding between the hot-melt coil strip and the outer wall of the lapped pipeline 6 and between the hot-melt coil strips is ensured.
As a specific embodiment of the method for constructing a heat insulating structure for a pipe joint according to the present invention, the step of sleeving the electric melting sleeve 1 on the outer circumference of the pipe joint and sleeving the connecting sleeve bodies 101 on the designated positions of the outer wall of the pipe respectively specifically includes:
the designed and produced electric melting sleeve 1 is lapped on the first electric melting coil strip 302 or the second electric melting coil strip 306 which are welded well, the area of the inner wall of the connecting sleeve body 101, which is provided with the first electric heating fuse 304, is completely lapped on the hot melting coil strip, and the butt joint of the electric melting sleeve 1 is in seamless close contact.
In the construction method of the heat insulation structure for the pipeline joint, which is provided by the invention, the air outlet hole 4 and the material injection hole 5 are positioned at the top of the central line of the welded hot melting sleeve.
As a specific embodiment of the method for constructing a heat insulating structure for a pipe joint according to the present invention, the filler 2 is a polyurethane foam mixture.
As a specific embodiment of the method for constructing a heat insulating structure for a pipe joint provided by the present invention, the blocking of the injection hole 5 and the air outlet hole 4 specifically includes:
the material injection hole 5 and the air outlet hole 4 are sealed by a special caulking block.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. Insulation construction for pipe joint, its characterized in that: comprises an electric hot melting sleeve and a filler filled between the electric hot melting sleeve and a pipeline joint;
the electric hot melting sleeve comprises two connecting sleeve bodies which are respectively sleeved on the peripheries of the pipelines at two sides of the pipeline joint, a heat insulation sleeve body which is arranged between the two connecting sleeve bodies and used for covering the pipeline joint, and a sealing connecting layer structure which is arranged on the inner side of the connecting sleeve body and used for being welded and sealed with the outer wall of the pipeline;
the heat insulation sleeve body is provided with an air outlet and a material injection hole for injecting the filler, and the filler is filled in the inner side of the heat insulation sleeve body through the material injection hole;
the sealing connection layer structure comprises a first electric hot melting coiled strip arranged on the inner side of the connection sleeve body, a second electric hot melting wire net which is embedded on the inner wall of the first electric hot melting coiled strip in a hot-pressing manner and is used for being welded with the outer wall of the pipeline, and a first electric hot melting wire net which is embedded on the inner wall of the connection sleeve body in a hot-pressing manner; the edges of two sides of the first electric hot melting winding strip are inclined planes which are mutually overlapped and matched, and a second electric hot melting wire which is used for being welded with the other inclined plane is embedded in one inclined plane in a hot pressing mode;
the sealing connection layer structure also comprises a second electric hot melting winding strip arranged between the connection sleeve body and the first electric hot melting winding strip, and a third electric hot melting wire net which is embedded on the inner wall of the second electric hot melting winding strip in a hot-pressing manner and is used for being welded with the first electric hot melting winding strip; the edges of two sides of the second electric hot melting winding strip are inclined planes which are mutually overlapped and matched, and a third electric hot melting wire which is used for being welded with the other inclined plane is embedded in one inclined plane in a hot pressing mode;
one side of the electric hot melting sleeve is provided with a melting sleeve sleeving seam, two side wall surfaces of the melting sleeve sleeving seam are inclined surfaces which are in lap joint and matched with each other, and a fourth electric hot fuse which is used for being in fusion joint with the other inclined surface is embedded into one of the inclined surfaces in a hot pressing mode.
2. The insulation structure for a pipe joint according to claim 1, wherein: the heat preservation sleeve body is an arc surface type sleeve body protruding outwards, the connecting sleeve body is a straight sleeve body, and the heat preservation sleeve body and the connecting sleeve body are in transition through an arc structure.
3. The insulation structure for a pipe joint according to claim 1, wherein: the heat insulation sleeve body is a sleeve body with a trapezoidal axial cross section, the bending part of the trapezoidal sleeve body is in transition through an arc structure, the connecting sleeve body is a straight sleeve body, and the heat insulation sleeve body and the connecting sleeve body are in transition through an arc structure.
4. The insulation structure for a pipe joint according to claim 1, wherein: the connecting sleeve body and the heat insulation sleeve body are both straight sleeve bodies, and the heat insulation sleeve body and the connecting sleeve body are in smooth transition.
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| CN201910749341.1A CN110513568B (en) | 2019-08-14 | 2019-08-14 | Heat preservation structure for pipeline joint |
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| CN201910749341.1A CN110513568B (en) | 2019-08-14 | 2019-08-14 | Heat preservation structure for pipeline joint |
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| CN110513568A CN110513568A (en) | 2019-11-29 |
| CN110513568B true CN110513568B (en) | 2021-11-16 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111365569A (en) * | 2020-04-17 | 2020-07-03 | 北京热力装备制造有限公司 | Heat insulation structure and heat insulation method of heat storage equipment |
| CN112325004A (en) * | 2020-11-06 | 2021-02-05 | 新兴铸管股份有限公司 | Pipeline joint heat insulation structure and construction method thereof |
| CN112901910A (en) * | 2021-03-30 | 2021-06-04 | 新兴铸管股份有限公司 | Protective heat-insulating structure for heat-insulating pipeline joint and construction method thereof |
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| CN110513568A (en) | 2019-11-29 |
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